Compact plug-on RS-232 to RS-485/422 media converter

  • Maximum Communication Speed: 500Kbps
  • Industrial Grade Temperature: -40~85°C
  • ESD Protection (IEC 61000-4-2: ESD level 3 protection)
  • External power not required (When RTS/DTR signal line is enabled)
  • Compact size
  • Hardware-based Auto Toggling
  • RS422/RS485 mode selectable by external switch
  • Built-in 120Ω termination resistors, selected by external switch
  • 3kV isolation
  • LED port power indicator

The SS100/SS100SiS media converters provide complete signal conversion between RS-232 and RS-422/485, without requiring an external power source. It is a fast and efficient solution to overcome distance limitations of RS232 or for connecting to industrial devices with an RS422/RS485 interface. The converters support both half-duplex 2-wire RS-485 and full-duplex 4-wire RS-422/485, and you could select mode via DIP switch without extra software required. Automatic data direction control is provided for RS-485. In this case, the RS-485 driver is enabled automatically when the circuitry senses the TxD output from the RS-232 signal. This means that no programming effort is required to control the transmission direction of the RS-485 signal.


Port Power over RS232
The RS-232 port of the SS100/SS100SiS is a DB9 female socket that can connect directly to the host PC, using the RTS/DTR lines to receive the power needed to run. Regardless of whether the signal is high, the can obtain enough power from the data line. SS100-SiS, the version with isolation, still requires an external power supply. When there are many devices connected to RS422 or RS485 signal lines, we recommend that external power supply is necessary.


LED Port Power Indicator
It is easy to let the SS100 test the device for you. Simply connect the SS100 to the device’s RS-232 port and set the RS485 Echo mode. If the power port LED indicator of PWR/Tx/RX lights up, then SS100 is receiving enough power and data communication is working properly.

Serial interface 
ModeRS422 : Point to point Mode, Multi-Drop Mode
RS485: Echo Mode, Non-Echo Mode
Speed1200bps ~ 500Kbps
Maximum Distance1.2Km. @115.2Kbps, 24AWG twisted pair cable
ConnectorRS232: DB9 female
RS422/485: Terminal block 6P (DC-Jack would be 4P)
Data bits5, 6, 7, 8
Stop bits1, 2
ParityNone, even, odd, space, mark
Data controlAuto toggling
Termination Resistor120Ω, selectable via dip switch
LEDsPower, Tx, Rx
Power Requirements 
PowerPower supply via RS232 port (RTS, DTR), by TB or DC Jack
Power input5 VDC
Power consumptionNon-ISO 115mW Max, ISO 220mW Max
Physical Characteristics 
Dimension33.8 x 76.4 x 17.5 mm
Weight21 g
Environmental Limits 
Operating Temperature-40°C ~ 85°C (-40°F ~ 185°F)
Storage Temperature-40°C ~ 85°C (-40°F ~ 185°F)
Ambient Relative Humidity5 to 95%, non-condensing
EMCEN55032/24, EN61000-6-4, EN61000-6-2, EN61000-3-2, EN61000-3-3
EMIFCC Part 15B Class A
IEC 61000-4-2ESDContact Discharge
Air Discharge
IEC 61000-4-3RS80-1000MHz10(V/m)3A
IEC 61000-4-4EFTAC Power Port±2.0KV3
IEC 61000-4-5SurgeAC Power PortLine-to-Line±1.0KV3B
IEC 61000-4-6CS0.15-80MHz10 Vrms3A
IEC 61000-4-8PFMFEnclosure30A/m (r.m.s)3A
IEC 61000-4-11DIPAC Power Port1. >95% reduction, 1 period
2. 60% reduction, 10 period
3. 30% reduction, 25 periods
4. >95% reduction, 250 periods
MTBF25.29 years
Warranty5 years
MODEL NAME PART NUMBERRS232RS422/485Isolation VoltagePower Connector
SS100-SiS-R1P1SS100000002GDB9TB-63000 VDC at RS232TB-2
UV305-0510(US-DC)50500051500003GDC jack (3.5/1.35/7.5 mm) power adapter, 100~240VAC input,
1.0A @ 5 VDC output, US plug, LV6
UVE305-0510 (EU-DC)50500051500013GDC jack (3.5/1.35/7.5 mm) power adapter, 100~240VAC
input, 1.0A @ 5 VDC output, EU plug, LV6
UVE305-0510(UK-DC)50500051500023GDC jack (3.5/1.35/7.5 mm) power adapter, 100~240VAC
input, 1.0A @ 5 VDC output, UK plug, LV6


Version Name Time Size Download
v0.3 Datasheet EN 2023-11-01 240.88 KB
v0.2 Datasheet EN 2020-07-20 278.57 KB
v0.1 Datasheet EN 2019-11-19 275.65 KB

Hardware Installation Guide

Version Name Time Size Download
v1.2 SS100 Hardware Installation Guide 2020-07-21 3.69 MB
v1.1 SS100 Hardware Installation Guide 2019-11-19 3.24 MB

Test reports

Version Name Time Size Download
SS100 Declarations of Conformity 2023-03-09 285.98 KB
v1.0 SS100 Certification CE 2019-11-20 3.26 MB
v1.0 SS100 Certification FCC 2019-11-20 3.26 MB

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